MFC of "Large set of CAM improvements" breaks I/O to Adaptec 29160 SCSI controller

[Pete French]

> I'm glad to hear it. But gmirror rebuild itself may be not enough for
> test. It uses very few requests same time. You should manage "Queue
> full" state, so you should make at least 150 concurrent write requests
> to the mirror running same time.

Am going to hammer it for a bit with a number of applications, but I
am very happy with the rebuld as this would never complete previously
so it's still a bit improvement!

-pete.